Suddenly warnings about cannabis are everywhere. At the beginning of February, researchers reported severe mental illness has spiked in young people in Canada alongside access to high-potency cannabis. The next day came the release of "A Killing In Cannabis," a book about a 2019 murder in California — and the violence that plagues the marijuana business and that legalization has not resolved. Then, on Feb. 9, the New York Times dropped its support for full cannabis legalization. Writing that the United States has "a Marijuana Problem," the paper admitted cannabis addiction and psychosis have become a crisis. It called for a ban on THC extracts, a move that would recriminalize much of the legal industry. (THC is the chemical in the plant that gets users high, and vapes offering near-pure hits of THC are now popular among users — and a big driver of industry profits.)